\Header{cement}{Heat Evolved by Setting Cements}
\keyword{datasets}{cement}
\begin{Description}\relax
Experiment on the heat evolved in the setting of each of 13
cements.\end{Description}
\begin{Usage}
\begin{verbatim}
data(cement)
\end{verbatim}
\end{Usage}
\begin{Format}\relax
\describe{
\item[\code{x1, x2, x3, x4}] Proportions (\%) of active ingredients

\item[\code{y}] heat evolved in cals/gm
}\end{Format}
\begin{Details}\relax
13 samples of Portland cement were set. For each sample, the percentages of the
four main chemical ingredients was accurately measured.  While the cement was
setting the amount of heat evolved was also measured.\end{Details}
\begin{Source}\relax
Woods, H., Steinour, H.H. and Starke, H.R. (1932) Effect of composition of 
Portland cement on heat evolved during hardening. 
\emph{Industrial Engineering and Chemistry}, \bold{24}, 1207--1214.\end{Source}
\begin{References}\relax
Hald, A. (1957)
\emph{Statistical Theory with Engineering Applications.}
Wiley, New York.\end{References}
\begin{Examples}
\begin{ExampleCode}
lm(y ~ x1 + x2 + x3 + x4, cement)
\end{ExampleCode}
\end{Examples}

